foo.c: In function 'main':
foo.c:21:7: warning: variable 'mini' set but not used [-Wunused-but-set-variable]
   int mini=0,min=a[0][maxj];
       ^~~~
foo.c:6:2: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d %d",&m,&n);
  ^~~~~~~~~~~~~~~~~~~~
foo.c:10:4: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
    scanf("%d",&a[i][j]);
    ^~~~~~~~~~~~~~~~~~~~

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